S6 V8-4.2L (BBD) (2004)
If the vehicle speed is not indicated.
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Connect VAG 1598/31 test box at wiring harness to Engine Control Module (ECM), do not connect ECM . See: Testing and Inspection/Scan Tool
Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Scan Tool Connecting and Initial Checks/Connecting VAG 1598/31
Test Box
The following wire connections must be checked for short circuit to B+, short circuit to Ground (GND) and for open circuit:
VAG1598/31 test box,
socket
Instrument cluster Terminal
54
Wire resistance: max: 1.5 Ohm
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Repair open circuit or short circuit if necessary.
If no malfunctions are found in wiring:
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Determine all "users" of speed signal (e.g. radio, automatic transmission, A/C system, etc.), disconnect those with a connection to instrument
cluster one after another and repeat test until cause is detected.
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Read readiness code. If DTC memory was erased, readiness code must be re-generated. See: Testing and Inspection/Monitors, Trips, Drive Cycles
and Readiness Codes/Audi Drive Cycle/Readiness Code/With Manufacturer's Scan Tool/Readiness Code, Generating